🔢 Part 1: Number Partitioning

1. Break apart these numbers to make addition easier. The first one is done for you.

Example: 37 + 18 = (30 + 7) + (10 + 8) = 40 + 15 = 55

a) 45 + 23 = (_____ + _____) + (_____ + _____) = _____ + _____ = _____

b) 56 + 29 = (_____ + _____) + (_____ + _____) = _____ + _____ = _____

2. Use partitioning to solve these subtraction problems:

a) 67 - 24 = _____

b) 83 - 35 = _____

↔️ Part 2: Commutative Property

3. Remember: 5 + 4 = 4 + 5. Complete these number sentences using the commutative property:

a) 8 + 6 = _____ + _____

b) 15 + 7 = _____ + _____

c) 9 + 12 = _____ + _____

d) 25 + 18 = _____ + _____

4. Circle the easier way to solve each problem:

For 3 + 27:

3 + 27

27 + 3

For 5 + 48:

5 + 48

48 + 5

📊 Part 3: Number Line Strategies

5. Use the number line strategy to solve these problems. Draw your jumps:

a) 34 + 16 = _____

b) 52 - 18 = _____

6. Which strategy would you use for each problem? Tick all that could work:

Problem: 46 + 27

Partitioning (break apart numbers)

Number line jumps

Known facts (doubles, near doubles)

Counting on

📝 Part 4: Word Problems

7. Solve these word problems. Show your working and explain your strategy:

a) There are 38 children in the playground. 24 more children join them. How many children are there now?

Answer: _____ children

Strategy I used: _________________________________

b) Sarah had 75 stickers. She gave away 29 stickers to her friends. How many stickers does she have left?

Answer: _____ stickers

Strategy I used: _________________________________

8. Create your own word problem using addition or subtraction with numbers up to 100:

Answer to my problem: _____

⚡ Part 5: Quick Facts Practice

9. Complete these addition and subtraction fact families:

a) 7 + 8 = _____ 8 + 7 = _____ 15 - 7 = _____ 15 - 8 = _____

b) 6 + 9 = _____ 9 + 6 = _____ 15 - 6 = _____ 15 - 9 = _____

c) 8 + 8 = _____ 16 - 8 = _____

10. Match the problem with the best strategy:

1. 50 + 30

2. 47 + 38

3. 25 + 26

4. 73 - 15

A. Near doubles

B. Mental maths (easy tens)

C. Partitioning

D. Number line jumps

Addition Subtraction Strategies

Addition Subtraction Strategies

🔢 Part 1: Number Partitioning

↔️ Part 2: Commutative Property

📊 Part 3: Number Line Strategies

📝 Part 4: Word Problems

⚡ Part 5: Quick Facts Practice

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